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Concentricity control apparatus for active magnetic journal bearing of induction motor

  • US 5,932,947 A
  • Filed: 01/26/1998
  • Issued: 08/03/1999
  • Est. Priority Date: 09/23/1997
  • Status: Expired due to Fees
First Claim
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1. An active magnetic journal bearing for controlling an eccentricity of a rotor axle of a motor, comprising:

  • a rotor connected to and rotating with the rotor axle of the motor;

    a stator bobbin cylindrically formed without any poles and disposed around said rotor with an air gap therebetween;

    a coil wound on the outside of said stator bobbin with a plurality of windings;

    a sensor for detecting any eccentricity of said rotor and said stator bobbin;

    an operation unit for calculating an instantaneous mutual inductance between said rotor and said stator bobbin based on the eccentricity detected by said sensor, for estimating a correction current to correct the detected eccentricity of the rotor according to the calculated mutual inductance, and for generating control signals corresponding to the estimated correction current in order to increase or decrease an electric current applied to said coil; and

    a driving circuit for controlling the electric current applied to said coil according to the control signals generated from said operation unit.

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